北京花楸 bei jing hua qiu

Pyrus discolor Maximowicz, Mém. Acad. Imp. Sci. St.-Pétersbourg Divers Savans 9: 103. 1859; P. pekinensis (Koehne) Cardot; Sorbus pekinensis Koehne.

Trees to 10 m tall. Branchlets purplish brown when old, terete, glabrous or nearly so when young, sparsely lenticellate when old; buds oblong-ovoid, 6–9 mm, apex shortly acuminate or acute; scales several, brownish, glabrous or puberulous. Leaves imparipinnate, together with rachis 10–20 cm; petiole 3–4(–6) cm; stipules persistent, 5–8 mm, lobed or coarsely serrate; rachis adaxially shallowly sulcate, glabrous, somewhat winged; leaflets 5–7 pairs, at intervals of 1.2–3 cm, basal pair usually smaller than others, blades oblong or oblong-elliptic to oblong-lanceolate, 3–6 × 1–1.8 cm, lateral veins 12–20 pairs, arcuate-anastomosing at margin, both surfaces glabrous, abaxially paler, glaucescent, base usually rounded, margin minutely sharply serrate, with 12–20 teeth on each margin, entire in basal 1/3, apex acute to shortly acuminate. Inflorescences loose, 5–8 × 5–10 cm, many flowered; rachis and pedicels glabrous, with small lenticels; bracts similar to stipules, but smaller. Pedicel 2–3 mm. Flower 6–8 mm in diam. Hypanthium campanulate, abaxially glabrous. Sepals triangular, 1–2 mm, apex ± obtuse or acute. Petals white, ovate or oblong-ovate, 3–5 × 2.5–3.5 mm, glabrous, apex obtuse. Stamens 15–20, ca. 1/2 as long as petals. Styles 3 or 4, nearly as long as stamens, sparsely pubescent basally. Fruit white or yellow, ovoid, 6–8 mm in diam.; sepals persistent. Fl. May, fr. Aug–Sep. 2n = 34*.

Broad-leaved mixed forests on sunny slopes; 1500--2000 m. Anhui, Gansu, Hebei, Henan, Nei Mongol, Shaanxi, Shanxi, Shandong.